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对福建省建瓯市山地红壤的天然林、人工林、次生林、园地和耕地5种典型土地利用方式的不同土层(0-10 cm、10-20 cm)土壤团聚体颗粒有机碳进行研究。结果表明:林地、桔园在大团聚体中表现随着粒径增大颗粒有机碳贮量增加的趋势。天然林转变为其他土地利用方式后,土壤团聚体颗粒有机碳贮量平均下降了74.35%,土壤颗粒有机碳损失发生在各个粒级团聚体中。亚热带山地红壤内林地转变为农地会导致土壤及其团聚体颗粒有机碳含量下降,颗粒有机碳可作为表达土地利用变化敏感性指标。
Soil organic carbon (SOC) in different soil layers (0-10 cm, 10-20 cm) was studied in five typical land uses of natural forests, plantations, secondary forests, orchard and farmland in mountainous areas of Jian’ou in Fujian Province. The results showed that the woodland and orange garden showed the tendency of increasing the organic carbon storage in the large aggregates as the particle size increased. After the natural forest was transformed into other land use patterns, the organic carbon storage of soil aggregates decreased by an average of 74.35%. The organic carbon loss of soil aggregates occurred in all fractions of aggregates. The conversion of woodlands into agricultural land in the subtropical mountainous red soil will lead to the decrease of organic carbon content in the soil and its aggregates. Particulate organic carbon may be used as a sensitive index to express the change of land use.